Add basic logging infrastructure for bugreports

Test: as follows
    - built, flashed, booted
    - "adb shell dumpsys netd" shows logs
    - tests/runtests.sh passes
Change-Id: I0e44da7f9a9cc53074ffc396b958e9e2dbcd2603
diff --git a/server/TetherController.h b/server/TetherController.h
index e163ae8..ce2d964 100644
--- a/server/TetherController.h
+++ b/server/TetherController.h
@@ -29,8 +29,6 @@
 namespace android {
 namespace net {
 
-using android::netdutils::StatusOr;
-
 class TetherController {
 private:
     struct ForwardingDownstream {
@@ -66,8 +64,7 @@
         int sendAllState(int daemonFd) const;
     } mDnsmasqState{};
 
-public:
-
+  public:
     TetherController();
     ~TetherController() = default;
 
@@ -122,7 +119,7 @@
 
     typedef std::vector<TetherStats> TetherStatsList;
 
-    StatusOr<TetherStatsList> getTetherStats();
+    netdutils::StatusOr<TetherStatsList> getTetherStats();
 
     /*
      * extraProcessingInfo: contains raw parsed data, and error info.